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ventoy_openwrt_squashfs.sh
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ventoy_openwrt_squashfs.sh
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#!/bin/bash
usage() {
echo ''
echo 'Usage: ventoy_openwrt_squashfs.sh openwrt-xxx-combined-squashfs.img.gz'
echo 'Example: '
echo ' ventoy_openwrt_squashfs.sh openwrt-19.07.7-x86-64-combined-squashfs.img.gz'
echo ' ventoy_openwrt_squashfs.sh lede-17.01.7-x86-64-combined-squashfs.img'
echo ''
}
if [ -f "$1" ]; then
suffix=${1##*.}
if [ "$suffix" = "img" ]; then
name=${1}
echo "processing $1 ..."
elif [ "$suffix" = "gz" ]; then
name=${1%.*}
echo "decompressing $1 ..."
zcat "$1" > $name
else
echo "Error: Invalid file format, $1 "
usage
exit 1
fi
efipart=$(dd if=$name bs=1 count=8 skip=512 status=none | hexdump -n8 -e '8/1 "%02X"')
if [ "$efipart" = "4546492050415254" ]; then
echo "GPT partition table"
B0=$(dd if=$name bs=1 count=1 skip=1192 status=none | hexdump -n1 -e '1/1 "%02X"')
B1=$(dd if=$name bs=1 count=1 skip=1193 status=none | hexdump -n1 -e '1/1 "%02X"')
B2=$(dd if=$name bs=1 count=1 skip=1194 status=none | hexdump -n1 -e '1/1 "%02X"')
B3=$(dd if=$name bs=1 count=1 skip=1195 status=none | hexdump -n1 -e '1/1 "%02X"')
B4=$(dd if=$name bs=1 count=1 skip=1196 status=none | hexdump -n1 -e '1/1 "%02X"')
B5=$(dd if=$name bs=1 count=1 skip=1197 status=none | hexdump -n1 -e '1/1 "%02X"')
B6=$(dd if=$name bs=1 count=1 skip=1198 status=none | hexdump -n1 -e '1/1 "%02X"')
B7=$(dd if=$name bs=1 count=1 skip=1199 status=none | hexdump -n1 -e '1/1 "%02X"')
startsec=$(printf "%ld" "0x$B7$B6$B5$B4$B3$B2$B1$B0")
endsec=$(expr $startsec + 1)
echo "partition 2: endsec=$endsec"
else
echo "MBR partition table"
B3=$(dd if=$name bs=1 count=1 skip=477 status=none | hexdump -n1 -e '1/1 "%02X"')
B2=$(dd if=$name bs=1 count=1 skip=476 status=none | hexdump -n1 -e '1/1 "%02X"')
B1=$(dd if=$name bs=1 count=1 skip=475 status=none | hexdump -n1 -e '1/1 "%02X"')
B0=$(dd if=$name bs=1 count=1 skip=474 status=none | hexdump -n1 -e '1/1 "%02X"')
secnum=$(printf "%ld" "0x$B3$B2$B1$B0")
B3=$(dd if=$name bs=1 count=1 skip=473 status=none | hexdump -n1 -e '1/1 "%02X"')
B2=$(dd if=$name bs=1 count=1 skip=472 status=none | hexdump -n1 -e '1/1 "%02X"')
B1=$(dd if=$name bs=1 count=1 skip=471 status=none | hexdump -n1 -e '1/1 "%02X"')
B0=$(dd if=$name bs=1 count=1 skip=470 status=none | hexdump -n1 -e '1/1 "%02X"')
startsec=$(printf "%ld" "0x$B3$B2$B1$B0")
endsec=$(expr $secnum + $startsec)
echo "partition 2: startsec=$startsec secnum=$secnum endsec=$endsec "
fi
filesize=$(stat -c "%s" $name)
mod=$(expr $filesize \% 512)
echo "filesize=$filesize mod=$mod"
if [ $mod -ne 0 ]; then
delta=$(expr 512 - $mod)
echo "align file mod=$mod delta=$delta"
dd if=/dev/zero of=$name bs=1 count=$delta seek=$filesize conv=notrunc status=none && sync
filesize=$(stat -c "%s" $name)
echo "align size is $filesize"
fi
filesec=$(expr $filesize / 512)
echo "endsec=$endsec filesize=$filesize filesec=$filesec"
if [ $endsec -gt $filesec ]; then
alignsec=$(expr $endsec - $filesec)
echo "Appending $alignsec sectors at the end of the file ..."
dd if=/dev/zero of=$name bs=512 count=$alignsec seek=$filesec conv=notrunc status=none && sync
else
echo "No need to process the file ..."
fi
echo ""
echo "======== SUCCESS ========="
echo ""
else
usage
exit 1
fi